Dimethylammonium trichlorocuprate(II): Structural transition, low-temperature crystal structure, and unusual two-magnetic chain structure dictated by nonbonding chloride-chloride contacts

The room-temperature crystal structure of Dimethylammonium trichlorocuprate consisting of a linear chain of [Cu.sup.2+] dimers with unusual magnetic properties is presented. The reported structure has solved the confusion regarding the origins of the magnetic behavior of the compound and gives a convincing example of the importance of two-halide magnetic exchange.